Intel Pentium 4 Processor 478-Pin Socket (mPGA478) Design Guidelines

Intel® Pentium® 4 Processor 478-Pin Socket (mPGA478)
R
19
SRO (S)
2B Connectin
g
Trace (T)
Pad (P)
TYPE A
SRO (S)
1BC Connecting
Trace (T)
Pad (P)
TYPE B
Connecting Trace
2B
1BC
2B
Via Pads (S)
1BC Connecting
Trace (T)
Pad (P) on both 2B and 1BC
Connecting Trace
1BC
2B
Via Shorting Plane
TYPEB
V + V - I - I +
Pad
Connecting Trace
PJRC
Figure 4-3. Four Different Jumpers Used in the Package Test Vehicle
Figure 4-4 (below) shows the physical locations (Pin side view) of the four types of jumpers in the Package
test vehicle. Care must be taken to make sure that the correct value of R
jumper
(mean) is subtracted from the
daisy chains type (A, B1 or B2).